Pro Mahjong Tsuwamono 64 - Jansou Battle ni Chousen is a Japanese Nintendo 64 mahjong game. The title translates to something along the lines of 'Pro Mahjong Warrior 64 - Challenge the Jansou Battle'.  This suggests a competitive mahjong experience with perhaps a story or tournament mode involving battling other mahjong players.  The gameplay would likely involve traditional Japanese mahjong rules but with added competitive elements that are not specified in this title.  Further information on the developers and specific release details would require additional research into Japanese gaming archives.

Pro Mahjong Tsuwamono 64 - Jansou Battle ni Chousen (Japan)

Premier Manager 64 (Europe)